Is orjson affected by CVE-2025-67221?

PyPI orjson is affected in <3.11.6.

Is CVE-2025-67221 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.5%.

high

CVE-2025-67221

Q: Is CVE-2025-67221 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.5%.

PyPI · orjson

Summary

orjson does not limit recursion for deeply nested JSON documents

Severity: high
EPSS: 0.5% (p42)
Also known as: GHSA-hx9q-6w63-j58v, PYSEC-2026-107
Published: 2026-01-22

References

https://nvd.nist.gov/vuln/detail/CVE-2025-67221
https://github.com/ijl/orjson/issues/620
https://github.com/kpatsakis/CVE-2025-67221/issues/1

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.